of esslingen-on-the-neckar



Reiuued an. 24, 1933 UNITED STATES PATENT OFFICE EUGEN SGHLIERER, OF ESSLINGEN-ON-THE-NEGKAR, GERMANY, ASSIGNOR TO THE FIRM: MERKEL & KIE'NLIN G. INL'B. 11., OF ESSLINGEN-ON-THE- NECKAR, GERMANY METHOD or rmrnnemrrme W001.

Ho Drawing. Original No. 1,846,908, dated February 28, 1932, Serial No. 414,216, filed December 14, 1929, and in Germany December 13, 1928. Applicationlor reissue filed May 11, 1932; Serial No. 610,701.

My invention relates to a method of impregnating wool fibre, to wit, wool in its initial condition, or wool yarn, but not to the impregnation of finished knitted goods. If fin shed goods are impregnated the spaces between the fibres will become clogged, and the finish-ed goods will be partly deprived of their heat-insulating properties.

It is an object of myinvention toimpregnate wool in such manner as not to interfere witli the heat-insulating properties of the woo To this end I treat the wool fibre or yarn with a saponaceous watery emulsion of oil or fat and thereupon with a solution of aluminiumv formate Al(CO I-I) and dry the wool at temperatures at 60-80 C.

It has already been suggested to impregnate cotton so as to render it water-repellent. However, the methods as suggested heretofore are not suitable for treating wool, as

t the impregnation interferes with its heat-insulating properties and impregnated garments or the like of wool are not better than cotton articles as to their heat-insulating properties.

According to my invention this drawback of the old methods is eliminatedby treating the wool as described herein.

In reducing my method to practice, I may treat 10 kilogrammes of wool yarn in an emulsion containing 5 grammes of soap and 10 grammes of olive oil in one litre of water. After having been treated with this emulsion for a short time, the yarn is placed in a solution containing 30 grammes of aluminium .2. The method of impregnating wool fibrecomprising treating the wool with a saponaceous watery emulsion of oil, containing 5 grammes of soap, and 10 grammes of olive oil, in one litre of water, then treating it with asolution of aluminium formate, containing 30 grammes of aluminium formate in one litre of water, and drying at 60-80".

- 3. The method of impregnating wool yarn comprising treating the wool with a saponaceous aqueous emulsion of an oleaginous material capable of forming asaponaceous emulsion and selected from a class consisting of fats andoils then treating it withan aqueous solution of drying at temperatures of about 60 to 80 C.

In testimony EUGEN SCHLIE ER.

formate in one litre of water, moved several times through the solution, and is then dried at 70 degs. centigrade, the temperature range of the drying being preferably 6080 C.

The impregnation effected in this manner is permanent and is not interfered with'by repeated immersion in water nor by the usual cleaning, of the impregnated articles.

The substances suitable for use in m invention consist of oleaginous materials, capable of forming a saponaceous emulsion and selected from a class consisting of fats and oils. i I

Various changes may be made in the dewhereof I aflix my si nature.

aluminum formate and- 

